The Lifestyle Beginner 44 - Week Half IRON Triathlon Training Plan is designed for the Beginning triathlete who has progressed from the Sprint distance to the Olympic triathlon distance and now desires to attempt the Half IRON distance, can handle a heavier training load, and desires to have a longer prep time to achieve a successful result as this Half IRON plan will introduce the beginning Half IRONMAN® athlete to the development of two aerobic energy systems, (V02 and Anaerobic threshold ...